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NEET 2011 (AIPMT, Prelims) · Motion in a Plane (2-D Kinematics)

Motion in a Plane (2-D Kinematics) question from NEET 2011 (AIPMT, Prelims)

Q19NEET 2011 · AIPMT · PRELIMSEasy

Motion in a Plane (2-D Kinematics)

A body is moving with velocity 30 m/s towards east. After 10 seconds its velocity becomes 40 m/s towards north. The average acceleration of the body is

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Answer: (d)

  1. Δv⃗=40 N^−30 E^\Delta\vec v = 40\,\hat N - 30\,\hat E, so ∣Δv⃗∣=402+302=50|\Delta\vec v| = \sqrt{40^2 + 30^2} = 50 m/s
  2. aav=∣Δv⃗∣t=5010=5a_{av} = \frac{|\Delta\vec v|}{t} = \frac{50}{10} = 5 m/s2^2
  3. So the answer is (d) 5 m/s2^2.
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